﻿/*
 * Copyright 2014, 2015 Dominick Baier, Brock Allen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;

namespace IdentityServer3.Core.Services.Default
{
    /// <summary>
    /// Claims filter for twitter. Filters out the "urn:twitter:userid" claim.
    /// </summary>
    public class TwitterClaimsFilter : ClaimsFilterBase
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="TwitterClaimsFilter"/> class.
        /// </summary>
        public TwitterClaimsFilter()
            : this("Twitter")
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="TwitterClaimsFilter"/> class.
        /// </summary>
        /// <param name="provider">The provider.</param>
        public TwitterClaimsFilter(string provider)
            : base(provider)
        {
        }

        /// <summary>
        /// Transforms the claims.
        /// </summary>
        /// <param name="claims">The claims.</param>
        /// <returns>Transformed claims</returns>
        protected override IEnumerable<Claim> TransformClaims(IEnumerable<Claim> claims)
        {
            return claims.Where(x => x.Type != "urn:twitter:userid");
        }
    }
}
